The main reasons for the increased secretion at the anus include the following: 1. Internal hemorrhoids, which occur above the dentate line of the anal canal, especially after the formation of the nucleus of the hemorrhoid, stimulate the surrounding rectal mucosa, resulting in increased secretion in the intestine. The nucleus of the hemorrhoid will come out of the anus during defecation and bring out some of the tissue fluid or mucus, thus causing an increase in secretion in the anus. 2. Anal fistula, which causes a fistula to form between the end of the rectum and the skin around the anus, thus causing a large amount of pus and intestinal secretions to flow out through the fistula and causing an increase in secretion around the anus. 3. Relaxation of the anal sphincter muscle, which causes the anus to fail to close completely and intestinal fluid and feces to flow out involuntarily. 4, anal sinusitis, perianal eczema, etc., can also lead to increased secretions around the anus and a humid environment.